Enhancing the catalytic activity and CO2 chemisorption ability of the perovskite cathode for soild oxide electrolysis cell through in situ Fe-Sn alloy nanoparticles

Herein, the Sn-doped perovskite oxide Sr1.95Fe1.4Sn0.1Mo0.5O6-δ (SFSnM), which exhibited in situ exsolved Fe-Sn alloy nanoparticles and controllable phase transformation, was synthesized to catalyze the reduction of CO2 through A-site deficiency regulation. The in situ exsolved Fe-Sn alloy nanoparticles were uniformly distributed on the surface of the SFSnM substrate after reduction, which significantly enhanced the catalytic activity and CO2 adsorption capacity of the SFSnM cathode. Moreover, a single cell with an [email protected] cathode exhibited excellent CO2 electrolysis performance, achieving a current density of 3.269 A cm−2 and an Rp value of 0.145 Ω cm2 at 800 °C and 1.8 V. Additionally, no significant performance attenuation was observed during a long-term stability test (200 h), indicating the good stability of [email protected] cathode. Overall, these results demonstrated that the designed [email protected] cathode shows great potential for high-performance solid oxide electrolysis cells (SOECs).